1428388 has 18 divisors (see below), whose sum is σ = 2708034. Its totient is φ = 658944.

The previous prime is 1428359. The next prime is 1428389. The reversal of 1428388 is 8838241.

It can be written as a sum of positive squares in 3 ways, for example, as 191844 + 1236544 = 438^2 + 1112^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 381 + ... + 1732.

2^1428388 is an apocalyptic number.

It is an amenable number.

1428388 is a deficient number, since it is larger than the sum of its proper divisors (1279646).

1428388 is a wasteful number, since it uses less digits than its factorization.

1428388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143 (or 2128 counting only the distinct ones).

The product of its digits is 12288, while the sum is 34.

The square root of 1428388 is about 1195.1518731944. The cubic root of 1428388 is about 112.6199674971.

Subtracting from 1428388 its product of digits (12288), we obtain a square (1416100 = 1190²).

The spelling of 1428388 in words is "one million, four hundred twenty-eight thousand, three hundred eighty-eight".